M Pang

[M Pang @mpangch]

Check out some of the fun things we've been up to at @OpenAeros in our latest update :) https://t.co/z3pc18RhPF

[M Pang @mpangch]

@PeteUK7 @drclairetaylor @_MYLUMENS @EwanEadie @TheOSLUVProject 4) There are even unit to unit variances in the 1m center irradiance 15% between two identical units of the same product from the same manufacturer (note different dates and catalog numbers)

[M Pang @mpangch]

@PeteUK7 @drclairetaylor @_MYLUMENS @EwanEadie @TheOSLUVProject 3) For the UK you want to use IEC 62471-6 / ICNIRP limits. You can set this is @TheOSLUVProject 's illuminate . It's very beta and a little slow (but works well) so pardon the dust :)

[M Pang @mpangch]

Example : https://t.co/y8wox1uD2k . Feedback welcome 🙂

[M Pang @mpangch]

So @vivian_belenky and OSLUV developed a free and open tool to calculate how safe and effective 222nm GUV systems are. Check out the (beta) tool at https://t.co/6LBsk3IMLx . Define a room -> add, place, and aim the lamps -> calculate safety and efficacy to your hearts content🙂

[M Pang @mpangch]

@chrisgj198 @OpenAeros @masknerd @chrisgj198 The repos are still being worked on but the electrical CAD files are technically online if you look ;)

[M Pang @mpangch]

Almost 2 years ago (Dec 27, 2021) - I sent @masknerd an email suggesting that we develop an open source condensation particle counter (CPC) to enable low cost and accessible air quality monitoring and quantitative fit testing for all.

He said yes and we founded @OpenAeros.

[M Pang @mpangch]

@dmitrygr IFD shot not clear enough to see ground speed and altitude to calculate time dilation . pls rectify

[M Pang @mpangch]

@NukitToBeSure @2b_technologies @jljcolorado Another thing is sampling point - per UL 867/UL 2998 - sampling is done 2 inches from the front of the device -O3 will be very high (10-20ppb) in this location (where its most conc due to light and 1/r2 decay) . For this reason 222nm UV can't pass UL 2998. (3/N)

[M Pang @mpangch]

@NukitToBeSure @2b_technologies @jljcolorado USHIO B1 - 120mW UV in a 12x12x10 unmodified office raised O3 from < 1 ppb to ~2ppb. 3 X B1 raised it to 5.3 ppb.

4 x Nukits have combind ~100mW (full battery) decreasing linearly to ~60 mW of UV as battery discharges . Should see similar (or smaller) ~1 ppb increase (2/N)

[M Pang @mpangch]

@NukitToBeSure @ghhughes @antiviral_mktng @masknerd @OpenAeros I wouldn't say it's easy to build for a home DIY maker, I will say I'm fairly sure @NukitToBeSure could build it with some finagling and considering SZ is your home ground :) Initial version is a R&D device, more versions to follow :)

[M Pang @mpangch]

@NukitToBeSure @ghhughes @antiviral_mktng @masknerd @OpenAeros <3 Thank you for the love and explanation - even though sometimes we disagree about things, it means the world when others recognize the work for what it is. Hoping to drop HW + SW on git by the end of the month probably a CERN OSHW license. We are in DFM as you rightly said.

[OpenAeros @OpenAeros]

It’s been a long road but we are so excited to share our progress on the world’s first open source, low-cost, condensation particle counter! What is it and why should you care? @masknerd explains why this CPC is a BFD.
https://t.co/AKj16IrVVx

[M Pang @mpangch]

@chrisgj198 @OpenAeros @masknerd We are actively working on staging files for first open source release which will happen soon :)

[M Pang @mpangch]

@WildPersistence @masknerd @OpenAeros We are working on some ideas along this line for the NIOSH fit test challenge :)

[M Pang @mpangch]

@SusanDavidsonM2 @Gee24218071 @OpenAeros @masknerd Inlet airflow is passed into warm chamber w/ a isopropanol wick - saturating it with IPA fluid then it goes into a chamber at 15C which causes fluid to condense on particles making them bigger :) Response time is v. fast - seconds.

[M Pang @mpangch]

@ericbkennedy @OpenAeros @masknerd https://t.co/84afCFaywK there is a sign up on the bottom right of our website :)

[M Pang @mpangch]

@jeffgilchrist @masknerd @OpenAeros Yep - that's the plan! Current version is hand made & intended for scientific/industry research community to independently study / verify / develop OpenCPC. We are already 10x - 20x cheaper than our competitive benchmark. The next 5x-10x will need scale - we are hard at work :)